Filling in a polygon

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YM
YM 2019-3-18
编辑： Stephan 2019-3-18
x8=[0 5 1 2.5 5];
y8=[2 2 5 0 5];
figure(7)
plot(x8,y8)
fill(x8,y8,'Red')
I used the above in the hopes of having a (red) filled polygon. Instead, triangle sections in the corners are filled, but not the entire polygon. Any advice so as to fill the entire polygon?

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回答（1 个）

Stephan
Stephan 2019-3-18
编辑：Stephan 2019-3-18
Hi,
it depends on the order you enter the single points. See this:
x8=[0, 2, 2.5, 3.5, 5, 4, 5, 3, 1, 1.5];
y8=[2, 2, 0, 2, 2, 3, 5, 3.5, 5, 3];
figure(7)
plot(x8,y8)
fill(x8,y8,'Red')
It starts at the first point P1(0,2) and goes counter-clockwise through the figure. Everytime there is a change of direction, the corresponding coordinates are entered.
Result is:
Best regards
Stephan

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